Really REALLY bad misfire under hard boost
08 February 2007, 01:21 PM
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Really REALLY bad misfire under hard boost
Okay here goes, sorry for the length of the post but PLEASE PLEASE read it.
Yesterday my car (MY99 UK Turbo) went to API for a VF29 fitting and Remap by Pat Herborn (sorry if I've spelt your Surname wrong).
They did a brilliant job (Nathan you star), but when it came to mapping the car, when they went above 1bar of boost the car misfired VERY badly over and over again.
Pat seemed to think it was an electrical fault and could pick up no other problems through his laptop so......
The car came back and they replaced:
Plugs (7's)
Leads
Coil pack
Also Checked:
Fuel pressure
Made sure there was proper earting points (added 3 more)
When the engine was cold the turbo ran for one run at 1.41bar in third gear with no problems at all.
However once the engine was hot above 1bar there was the major misfire again, so bad that David had to back off for fear of breaking the propshaft.
Pat held the boost back to 1bar so that we all could go home, this was at 7pm and API had been closed from 5pm!!!!
Has anyone had the same problem or any ideas what the problem is before we get it on a Dyno for further investigation?
I would like to say thanks to Nathan, David and Pat for going above and beyond the call of duty to try to find out the cause of the misfire.
It's very easy to praise a company when things go right, but you soon find out who truely gives good customer service when things go wrong. David stuck to his word on price even though the workshop stayed open 2 hours after closing time
Spec is:
VF29
STI 8 intercooler
Walbro fuel pump
3 inch decat (wrapped and sprayed)
Simota Panel filter
3 port boost solenoid
Full induction hoses from airbox to turbo
MAF replaced 6 months ago
Any help will be much appreciated.
Damo
Yesterday my car (MY99 UK Turbo) went to API for a VF29 fitting and Remap by Pat Herborn (sorry if I've spelt your Surname wrong).
They did a brilliant job (Nathan you star), but when it came to mapping the car, when they went above 1bar of boost the car misfired VERY badly over and over again.
Pat seemed to think it was an electrical fault and could pick up no other problems through his laptop so......
The car came back and they replaced:
Plugs (7's)
Leads
Coil pack
Also Checked:
Fuel pressure
Made sure there was proper earting points (added 3 more)
When the engine was cold the turbo ran for one run at 1.41bar in third gear with no problems at all.
However once the engine was hot above 1bar there was the major misfire again, so bad that David had to back off for fear of breaking the propshaft.
Pat held the boost back to 1bar so that we all could go home, this was at 7pm and API had been closed from 5pm!!!!
Has anyone had the same problem or any ideas what the problem is before we get it on a Dyno for further investigation?
I would like to say thanks to Nathan, David and Pat for going above and beyond the call of duty to try to find out the cause of the misfire.
It's very easy to praise a company when things go right, but you soon find out who truely gives good customer service when things go wrong. David stuck to his word on price even though the workshop stayed open 2 hours after closing time
Spec is:
VF29
STI 8 intercooler
Walbro fuel pump
3 inch decat (wrapped and sprayed)
Simota Panel filter
3 port boost solenoid
Full induction hoses from airbox to turbo
MAF replaced 6 months ago
Any help will be much appreciated.
Damo
Last edited by Damocell; 08 February 2007 at 01:24 PM.
08 February 2007, 01:26 PM
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David suggested posting on here to see if anyone has had the problem.
It was as if the car was just holding up two fingers to the boost with no obvious signs of why.
Damo
08 February 2007, 01:28 PM
#4
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tis a strange one, maybe sugest checking the timing to him. mates car was out and pat managed to find that, but was ideling like a badgers **** crack. just might be not far enough out to be a problem till its firing.
Dodgy fuel?
Dodgy fuel?
08 February 2007, 01:47 PM
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Boost solenoid was fitted yesterday.....however it was second hand.
Anyone else?
Need as many avenues as possible for when we get it on the dyno.
Damo
Anyone else?
Need as many avenues as possible for when we get it on the dyno.
Damo
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08 February 2007, 07:09 PM
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just had this problem when i changed the spark plugs
so i just been in the garage swaped them back and its smoothhhhhh as can be
the problem was in 3 4 5gear at 3k to 5k rpm on full throttle now its fine
try taking the plugs out and putting them back in (torqed to 17 myself)
not sure if its the best setting, hope it cures it mate
mark,
so i just been in the garage swaped them back and its smoothhhhhh as can be
the problem was in 3 4 5gear at 3k to 5k rpm on full throttle now its fine
try taking the plugs out and putting them back in (torqed to 17 myself)
not sure if its the best setting, hope it cures it mate
mark,
08 February 2007, 09:44 PM
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just had this problem when i changed the spark plugs
so i just been in the garage swaped them back and its smoothhhhhh as can be
the problem was in 3 4 5gear at 3k to 5k rpm on full throttle now its fine
try taking the plugs out and putting them back in (torqed to 17 myself)
not sure if its the best setting, hope it cures it mate
mark,
so i just been in the garage swaped them back and its smoothhhhhh as can be
the problem was in 3 4 5gear at 3k to 5k rpm on full throttle now its fine
try taking the plugs out and putting them back in (torqed to 17 myself)
not sure if its the best setting, hope it cures it mate
mark,
Damo
08 October 2007, 12:32 PM
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Fixed the problem finally....
The plugs were gapped to 0.8mm I have now gapped them to 0.7mm and the misfire has completely gone away
Damo
The plugs were gapped to 0.8mm I have now gapped them to 0.7mm and the misfire has completely gone away
Damo
08 October 2007, 12:54 PM
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Just found this thread, I had missfire probs on mine under hard acceleration and found that 2 of the 4 plugs were shot, changed all 4 and we were back in business.
But you seem to have found and resolved the problem.
But you seem to have found and resolved the problem.
08 October 2007, 07:51 PM
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subaru sti version 2 boost problem
does anyone know the correct boost psi ...my car had a bleed valve fitted and it was over boosting so i screwed the bleed valve back and now its only boosting at 0.8 of boost ....does anyone know what the proper setting of boost is for the sti 1995 version 2 cheers
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